申请人:MEDICHEM RESEARCH, INC.
公开号:EP1054007A2
公开(公告)日:2000-11-22
A method of preparing (±)-calanolide A, 1, a potent HIV reverse transcriptase inhibitor, from chromene 4 is provided. Useful intermediates for preparing (±)-calanolide A and its derivatives are also provided. According to the disclosed method, chromene 4 intermediate was reacted with acetaldehyde diethyl acetal or paraldehyde in the presence of an acid catalyst with heating, or a two-step reaction including an aldol reaction with acetaldehyde and cyclization either under acidic conditions or neutral Mitsunobu conditions, to produce chromanone 7. Reduction of chromanone 7 with sodium borohydride, in the presence of cerium trichloride, produced (±)-calanolide A. A method for resolving (±)-calanolide A into its optically active forms by a chiral HPLC system or by enzymatic acylation and hydrolysis is also disclosed. Finally, a method for treating or preventing viral infections using (±)-calanolide or (-)-calanolide is provided.
本研究提供了一种由色烯 4 制备 (±)-calanolide A, 1 的方法,(±)-calanolide A, 1 是一种有效的 HIV 逆转录酶抑制剂。还提供了制备 (±)-calanolide A 及其衍生物的有用中间体。根据所公开的方法,在酸性催化剂存在下,加热铬烯 4 中间体与乙醛二乙缩醛或副醛反应,或在酸性条件下或中性三忍条件下进行两步反应,包括与乙醛的醛醇反应和环化反应,生成色满酮 7。在三氯化铈存在下,用硼氢化钠还原色满酮 7,生成(±)-丙醇内酯 A。此外,还公开了一种通过手性 HPLC 系统或酶酰化和水解将 (±)-calanolide A 分解为其光学活性形式的方法。最后,还提供了一种使用 (±)-calanolide 或 (-)-calanolide 治疗或预防病毒感染的方法。